I don't think you have passkey 2 but the web link is for that system if i am wrong.http://vats.likeabigdog.com/I don't think you have passkey 2 but the web link is for that system if i am wrong. http://vats.likeabigdog.com/

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The only way to do it, beside bypassing it. Is to have the car running. find the data wire from the BCM to the ECM and cut it. This puts the ECM into default mode, it also set the security light. The car will start and run though. The draw back is. That if the battery goes dead or you disconnect power from the ECM. the ECM will reset and the car won't run. This can only be done on passkey and passkey1. I haven't tried it on passkey2. It will not work on passkey3.

The system you have is Passkey VATS. On your 91 there are 2 ways to bypass this system. One is a partial bypass that works in certain situations, and another that works in ALL situation. This link explains alot and offers solutions to help you beat this.

The problem might be your Vats security system. This causes the car to either "not start" or "shut down" while running, or start for 5 seconds and then die. (depending on the system) If the security light flashes, i guarantee that this is what the problem is. 1st trick, (if not starting) turn the key forward 2 clicks till right before it would normally start, leave like that for 10 minutes. ( no less ) After 10 minutes, turn key back then forward and your car might start. I did this in my regal for more than a year. If its shuting down while running, im sorry i have no quick fix...

Cheap fix: Bypass the chip in your key. Temporary, but effective. Until the TDM (theft deterrent module) in the dash poops out, then you're kinda screwed. I was told that these types of key security systems have a 7-10 year life span. Sucks for us. This link explains the "Key Issue" pretty well.
----- http://vats.likeabigdog.com/

Never worry again fix: Bypass the whole VATS/Passlock/passkey I or passkey II system entirely. Literally take it out, and throw it away. I just did this in my Regal. Took about an hour. Took longer to find the thing than it did to fix the problem. For a list of cars effected by this problem. See the NEWROCKIES link on the right side of their page......... They sell a unit for 200 bucks to totally bypass this system FOREVER. life time-money back and all that. Finally did this in my car. Well worth the 200 if you've looked into getting this replaced... Anywhere from 600-1000 bucks.
----- http://newrockies.ca?ap_id=judd0081----- With this fix, you can take that whole Vats, passlock, passkey **** system out of your car all together. Good info on both sites

It's when the security light starts flashing that the infamous "chip" in the key becomes a nightmare to many. Gradually the car begins not cranking anymore or if it cranks it would start and die in a second. Randomly it will do this more and more often until it won't start anymore. VATS, PASSkey and Passlock immobilizer systems are killing cars all over North America, they have a short lifespan and are certainly more effective against owners than thieves. Here is how you save your car
1st trick, (if not starting) turn the key forward 2 clicks till right before it would normally start, leave like that for 10 minutes. ( no less ) After 10 minutes, turn key back then forward and your car might start. I did this in my regal for more than a year. If its shuting down while running, im sorry i have no quick fix...

Cheap fix: Bypass the chip in your key. Temporary, but effective. Until the TDM (theft deterrent module) in the dash poops out, then you're kinda screwed. I was told that these types of key security systems have a 7-10 year life span. Sucks for us. This link explains the "Key Issue" pretty well.
----- http://vats.likeabigdog.com/

Never worry again fix: Bypass the whole VATS/Passlock/passkey I or passkey II system entirely. Literally take it out, and throw it away. I just did this in my Regal. Took about an hour. Took longer to find the thing than it did to fix the problem. For a list of cars effected by this problem. See the NEWROCKIES link on the right side of their page......... They sell a unit for 200 bucks to totally bypass this system FOREVER. life time-money back and all that. Finally did this in my car. Well worth the 200 if you've looked into getting this replaced... its anywhere from 600-1000 bucks.
----- http://newrockies.ca?ap_id=judd0081----- With this fix, you can take that whole Vats, passlock, passkey **** system out of your car all together. Good info on both sites

You Cannot cut any wires to bypass on this system. The passlock security needs to see a valid key in order to have the PCM enable the fuel and Ignition. This system is complex and cannot be bypassed with the cutting of a wire.